Improvement in harvester-pitmen



` Patented Sep. 24,187.2-

f B, "E, JyElLs. `lmp'r/dvement in Harvester-Pitman.

fzze am@ UMTTD STAT-EST.

y 'n.nnwnnn mains, or wAs'nIneroN, DISTRICT or COLUMBIA.

` IMPROVEMENT lN HARVESTEFl-PITMEN.

A Specication forming part of Letters Patent No. 131,671, datedSeptember 24, 1872.

To all whomjt `may concern: t

`Be it known that I, B. EDWARD J. EILs, l residingat Washington, in theDistrict of Goin Harvester-Pitmemof which'the following is aspecification: A,

provide, as a connection between a pitman and' ,yeciprocating device,anmoneslsloihnt, Vfor the purposeiof preventing the us wear andycnsequentxabnormal lost motion, which, al ways objectionabl,"'"ae`particularly so in the joint between i the pitman and the cutter-bar ofa harvester, for which 'the invention is more especially designed,although its peculiar quality will at once suggest the desirableness ofits application to reciprocating sawing-machines and many other machinesin which a pitman or connecting-rod is used, as part of a mech! anismfor converting rotary into reciprocating motion,or vice versa.

In the conception of the first part of my invention due advantage wastaken of the fact that there always is buta limited oscillatory motionin the joint between a pit-man and a reciprocating device. `To take upthese slight oscillations and `still `avoid a moving of surgi `facesuponeach other in the joint, I provide i it withan elasticmedium whichis IIrLp'lyQQnj` M th o fast ed'to the pitman ,and so t t igwdevice thatthe said oscillations `will re nlt merely in a slight"t,iyjjdiliImgllofjthe` elastic medium. This principle may ntakeembodiment in a variety of forms. i Every one `of the joints whichI haveselected as illustrations :iscomposed of arigid pitman- `Wrist andanelastic socket, which is made fast upon said wrist and suitablyconnected', though notiiecessarilyxed, to the reciprocating det vice.`The` secondgtpartof my invention con` sists in such `en adaptation ofthe above-dei scribedtorsionaljointto harvestersasto permit theusualfolding of thecutting apparatus,

as well as the motions of the latter in following the surfaceineqi'ialities,` should the iexibility ofthe elastic medium at any timeprove insufiicient for the latter purpose, as is possible where suchelastic mediumis vof uniform stiff` ness throughout. i y Y Figures 1 and2 illustrate a very simple form i of my invention,suitable forharvesterpitmen. Figs. 3f and 4 are delineations of the simplest elumbia,.have inventeda certain Improvement 'rhopnnoipai object of this'invonnonisto l structure of my invention. Figs. 5 and and 7 and 8represent modifications of the `joint shown in the irst two iigures.

The same letters of reference are employed v identical ablyfmade of agood quality of `India-rubber, im

and is inserted or formed in the heel orknuckle of the reciprocatingdevice, and a rigisTTd or wrist, B, which is immovably fixed to thepitman and also firmly secured to the elastic socket. As showTiFigsBand4, the socket is sprung over an angular and taperingpitmanwris-tad'lilivvis'esprung into an angular and flaring aperture inthe AendY G of areciprocating device. This method of connecting theparts, which is also adopted in the joints shown respectively in Figs. land 2 and and 8, is very simple and convenient, and will ordinarily bequite sufficient to prevent accidental disconnection or disarran gementthereof, but the parts may be connected together in any other preferredmanner, provided the principal conditions rst stated are complied with,Such i a torsional joint, while it answers every purpose wheretlreciprocating device moves in iixed guides,'requires to be somewhatmodiiied in construction to adapt it for use on harvesterpitmen, inorder to permit thefolding of the cutting apparatus. One form of jointfor this purpose is illustrated in Figs. l and 2, and is composed of acylindrical or. circular socket, inserted in a corresponding aperture inthe knife-heelwlm), and an angular pitman-wrist, 'wh'ilmimfastened in aneccentric eye in the elastic socket. The cutterbar may now be turned onthe socket, but the oscillations of C the pitman will, as heretofore,only result in a slightmwuisttipgmof the latter. In case the elasticsocket is sprung into the knife-heel, as here shown, a thin split ring,a, may intervene between the twd to reduce the friction. An inferiormodification of this joint is shown in i, Figs. 7 and S, in which the-pitman-wrist is fast A ened in a concentric eye of the elastic socket,

and the fiction between the knife-*heel and the socket relied upon forpreventing any motion et, and thus aid in preventing any oscillationthereof. e

Another form of joint adapted to harvesterpitmen is illustrated in Figs.5 and 6, in which f the elastic socket is composed of an interiorportion, al, of sti and an exterior portion, a2, of more iiexibleIndia-rubber. The two portions of the socket are vulcanized together, fand the socket itself is likewise v fublxtnigtoh ,f3- ,fthlignkuifgheel. The pitman-wrist is, as usual,

, the pitman as possible.

When ready detachability of the pitmau and the reciprocating device fromeach other is desirable, as in harvesters, it maybe provided for at thejunction of the Wrist and and the pitman, or in various other Ways.

It will be understood that the elastic medium may take other forms thanthat of a socket or sleeve and be applied in many diierent ways Withoutdeparting from the principle of my invention as above stated.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. A frictionless joint betweena pitmau and a reciprocating device,embodying in itsvcoustruction an elastic medium, which, with its torsionalone, takes up the oscillations of the pitman, as described. V

2. A harvester cutter-bar and pitman connected together by such atorsional joint, constructed to permit the folding of the cuttingapparatus.

3. A harvester cutter-bar and pitman connected together by an elasticsocket fitting a circular .aperture in the knife-heel and a rigid wristfast in an eccentric eye in the elastic socket. j

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

B. EDW. J. EILS.

Witnesses:

A. RUPPERT, W. BRADFORD.

